linux-kernel - Re: [PATCH 5/5] have smaps show transparent huge pages

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Date:	Thu, 10 Feb 2011 11:20:32 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Michael J Wolf <mjwolf@...ibm.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH 5/5] have smaps show transparent huge pages

On Wed, Feb 09, 2011 at 11:54:13AM -0800, Dave Hansen wrote:
> 
> Now that the mere act of _looking_ at /proc/$pid/smaps will not
> destroy transparent huge pages, tell how much of the VMA is
> actually mapped with them.
> 
> This way, we can make sure that we're getting THPs where we
> expect to see them.
> 
> Signed-off-by: Dave Hansen <dave@...ux.vnet.ibm.com>
> Acked-by: David Rientjes <rientjes@...gle.com>
> ---
> 
>  linux-2.6.git-dave/fs/proc/task_mmu.c |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff -puN fs/proc/task_mmu.c~teach-smaps-thp fs/proc/task_mmu.c
> --- linux-2.6.git/fs/proc/task_mmu.c~teach-smaps-thp	2011-02-09 11:41:44.423556779 -0800
> +++ linux-2.6.git-dave/fs/proc/task_mmu.c	2011-02-09 11:41:52.611550670 -0800
> @@ -331,6 +331,7 @@ struct mem_size_stats {
>  	unsigned long private_dirty;
>  	unsigned long referenced;
>  	unsigned long anonymous;
> +	unsigned long anonymous_thp;
>  	unsigned long swap;
>  	u64 pss;
>  };
> @@ -394,6 +395,7 @@ static int smaps_pte_range(pmd_t *pmd, u
>  			spin_lock(&walk->mm->page_table_lock);
>  		} else {
>  			smaps_pte_entry(*(pte_t *)pmd, addr, HPAGE_SIZE, walk);
> +			mss->anonymous_thp += HPAGE_SIZE;

I should have thought of this for the previous patch but should this be
HPAGE_PMD_SIZE instead of HPAGE_SIZE? Right now, they are the same value
but they are not the same thing.

>  			return 0;
>  		}
>  	}
> @@ -435,6 +437,7 @@ static int show_smap(struct seq_file *m,
>  		   "Private_Dirty:  %8lu kB\n"
>  		   "Referenced:     %8lu kB\n"
>  		   "Anonymous:      %8lu kB\n"
> +		   "AnonHugePages:  %8lu kB\n"
>  		   "Swap:           %8lu kB\n"
>  		   "KernelPageSize: %8lu kB\n"
>  		   "MMUPageSize:    %8lu kB\n"
> @@ -448,6 +451,7 @@ static int show_smap(struct seq_file *m,
>  		   mss.private_dirty >> 10,
>  		   mss.referenced >> 10,
>  		   mss.anonymous >> 10,
> +		   mss.anonymous_thp >> 10,
>  		   mss.swap >> 10,
>  		   vma_kernel_pagesize(vma) >> 10,
>  		   vma_mmu_pagesize(vma) >> 10,
> _
> 

-- 
Mel Gorman
SUSE Labs
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